×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Bearing strength

Bearing strength

Bearing strength

(OP)
Hey everyone,

I have a question concerning the bearing strength in FRP. The ASTM D953 standard defines the bearing strength taken as the force at 4% hole deformation divided by the bearing area (hole diameter x thickness).

What is the reason for choosing 4% hole deformation as the strength limit instead of the ultimate load?

RE: Bearing strength

Maybe to avoid excessive deformation.

RE: Bearing strength

(OP)
Which is fair. But in that case, is it more of a serviceability requirement as opposed to an ultimate strength requirement?

For example I've seen some design guidelines which state disregard this provision completely and to simply take the ultimate failure load as the bearing strength.

RE: Bearing strength

ASTM D5961 considers both the bearing offset strength and the ultimate strength. From ASTM D5961, "Discussion—Two types of bearing strengths are commonly identified, and noted by an additional superscript: offset strength and ultimate strength."

Also, from "Practical Analysis of Aircraft Composites":
"The bearing strength design value may also be limited by program requirements, fatigue requirements, or other limitations. For some structures,such as those that require fuel seals, excessive hole elongation may be unacceptable."

Brian
www.espcomposites.com

RE: Bearing strength

(OP)
ESPComposites,

Thank you very much for the additional references. I wasn’t aware of the existence of D5961. I think that one gives me a much better indication for which way to go forward.

Thanks!

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources

Ebook - Mastering Tolerances for Machined Parts
When making CNC machined parts, mastering tolerances can be challenging. Are general tolerances good enough? When does it make sense to call out for tighter tolerances? Do you need a better understanding of fits, datums, or GD&T? Learn about these topics and more in Xometry's new e-book. Download Now
eBook – How to Choose the Correct Corrosion Testing Method
When designing a metal component, engineers have to consider how susceptible certain alloys are to corrosion in the final product’s operating environment. In a recent study by NACE (National Association of Corrosion Engineers), it was estimated that the direct and indirect costs of corrosion in the United States is approximately 6.2% of the GDP. In 2016, that cost exceeded $1 trillion dollars for the first time. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close